Orientation effects in copper phthalocyanine films studied by EPR

Solveig Felton, Marc Warner, Soumaya Mauthoor, Jules Gardener, Daniel Klose, Salahud Din, Gavin W. Morley, Wei Wu, Andrew J. Fisher, Gabriel Aeppli, Christopher W. M. Kay, Sandrine Heutz

Research output: Contribution to conferencePoster

Abstract

Organic semiconductors have already found commercial applications in for example displays with organic light-emitting diodes (OLEDs) and great advances are also being made in other areas, such as organic field-effect transistors and organic solar cells. [1] The organic semicondutor group of materials known as metal phthalocyanines (MPc’s) is interesting for applications such as large area solar cells due to their optoelectronic properties coupled with the possibility of easily and cheaply fabricating thin films of MPc’s. [1, 2]

Many of the properties of organic semiconductors, such as magnetism, light absorption and charge transport, show orientational anisotropy. [2, 3] To maximise the efficiency of a device based on these materials it is therefore important to study the molecular orientation in films and to assess the influence of different growth conditions and substrate treatments. X-ray diffraction is a well established and powerful technique for studying texture (and hence molecular orientation)_in crystalline materials, but cannot provide any information about amorphous or nanocrystalline films. In this paper we present a continuous wave X-band EPR study using the anisotropy of the CuPc EPR spectrum [4] to determine the orientation effects in different types of CuPc films. From these measurements we also gain insight into the molecular arrangement of films of CuPc mixed with the isomorphous H2Pc and with C60 in films typical of real solar cell systems.
Original languageEnglish
Pages76-76
Publication statusPublished - Mar 2010
Event43rd Annual International Meeting of the ESR Spectroscopy Group of the Royal Society of Chemistry - Cardiff, United Kingdom
Duration: 21 Mar 201025 Mar 2010

Conference

Conference43rd Annual International Meeting of the ESR Spectroscopy Group of the Royal Society of Chemistry
CountryUnited Kingdom
CityCardiff
Period21/03/201025/03/2010

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